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Fix more corner case that could cause the top of minute alarm to stop firing

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This commit is contained in:
Alessandro Genova
2025-08-08 09:19:14 -04:00
parent a616ac6cc4
commit 9770ad4fe9
4 changed files with 98 additions and 28 deletions
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watch-library/hardware/watch/watch_rtc.c
+28 -7
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@@ -198,7 +198,7 @@ void watch_rtc_disable_all_periodic_callbacks(void) {
watch_rtc_disable_matching_periodic_callbacks(0xFF);
}
static void _watch_rtc_schedule_next_comp(void) {
void watch_rtc_schedule_next_comp(void) {
rtc_counter_t curr_counter = watch_rtc_get_counter();
// If there is already a pending comp interrupt for this very tick, let it fire
// And this function will be called again as soon as the interrupt fires.
@@ -245,7 +245,17 @@ void watch_rtc_register_comp_callback(watch_cb_t callback, rtc_counter_t counter
comp_callbacks[index].callback = callback;
comp_callbacks[index].enabled = true;
_watch_rtc_schedule_next_comp();
watch_rtc_schedule_next_comp();
}
void watch_rtc_register_comp_callback_no_schedule(watch_cb_t callback, rtc_counter_t counter, uint8_t index) {
if (index >= WATCH_RTC_N_COMP_CB) {
return;
}
comp_callbacks[index].counter = counter;
comp_callbacks[index].callback = callback;
comp_callbacks[index].enabled = true;
}
void watch_rtc_disable_comp_callback(uint8_t index) {
@@ -255,13 +265,21 @@ void watch_rtc_disable_comp_callback(uint8_t index) {
comp_callbacks[index].enabled = false;
_watch_rtc_schedule_next_comp();
watch_rtc_schedule_next_comp();
}
void watch_rtc_disable_comp_callback_no_schedule(uint8_t index) {
if (index >= WATCH_RTC_N_COMP_CB) {
return;
}
comp_callbacks[index].enabled = false;
}
void watch_rtc_callback(uint16_t interrupt_cause) {
// First read all relevant registers, to ensure no changes occurr during the callbacks
uint16_t interrupt_enabled = RTC->MODE0.INTENSET.reg;
rtc_counter_t comp_counter = RTC->MODE0.COMP[0].reg;
rtc_counter_t counter = watch_rtc_get_counter();
if ((interrupt_cause & interrupt_enabled) & RTC_MODE0_INTFLAG_PER_Msk) {
@@ -291,15 +309,18 @@ void watch_rtc_callback(uint16_t interrupt_cause) {
if ((interrupt_cause & interrupt_enabled) & RTC_MODE0_INTFLAG_CMP0) {
// The comp interrupt is generated one tick after the matched counter
// rtc_counter_t comp_counter = watch_rtc_get_counter() - 1;
rtc_counter_t comp_counter = counter - 1;
for (uint8_t index = 0; index < WATCH_RTC_N_COMP_CB; ++index) {
if (comp_callbacks[index].enabled && comp_counter == comp_callbacks[index].counter) {
// Give it a little bit of wiggle room, if a comp callback is enabled and is just passed
if (comp_callbacks[index].enabled &&
(comp_counter - comp_callbacks[index].counter) <= RTC_CNT_HZ
) {
comp_callbacks[index].enabled = false;
comp_callbacks[index].callback();
}
}
_watch_rtc_schedule_next_comp();
watch_rtc_schedule_next_comp();
}
if ((interrupt_cause & interrupt_enabled) & RTC_MODE0_INTFLAG_OVF) {